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v3.25.2

Schedule of Assumptions Used in Determining MSR Value (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Prepayment speed | 10.79 | 8.79
Average life (years) | 7 years 9 months 7 days | 8 years 3 months 10 days
Discount rate | 11.97 | 12.14

X
- Definition Average Life In Years. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the Discount Rate, during the indicated time period. + References No definition available. + Details
Name: | SNFCA_DiscountRate
Namespace Prefix: | SNFCA_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Prepayment speed. + References No definition available. + Details
Name: | SNFCA_PrepaymentSpeeds
Namespace Prefix: | SNFCA_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration